Check that division by zero in fastmath doesn't throw

Author: vchuravy

test/fastmath.jl

@@ -60,8 +60,8 @@ fm_fast_64_upd(x) = @fastmath (r=x; r+=eps64_2; r+=eps64_2)
         @test @fastmath(cmp(two,two)) == cmp(two,two)
         @test @fastmath(cmp(two,three)) == cmp(two,three)
         @test @fastmath(cmp(three,two)) == cmp(three,two)
-        @test @fastmath(one/zero) == convert(T,Inf)
-        @test @fastmath(-one/zero) == -convert(T,Inf)
+        @test @fastmath(one/zero) isa T   # must not throw
+        @test @fastmath(-one/zero) isa T  # must not throw
         @test isnan(@fastmath(zero/zero)) # must not throw
 
         for x in (zero, two, convert(T, Inf), convert(T, NaN))